Co负载TiO2/氧化石墨烯纳米复合材料的水热法合成及光催化性能

首先采用改进的Hummers法制得氧化石墨烯(GO)，再利用氧化石墨烯为基体，硫酸钛和氯化钴为前驱体，并通过修饰石墨烯的聚乙烯亚胺(PEI)为交联剂，采用一步水热法成功合成了三维柱状自组装的钴负载TiO2/氧化石墨烯纳米复合材料(Co@/TiO2/PEI/RGO)。通过紫外-可见吸收光谱法、X射线衍射、透射电子显微镜和X射线光电子能谱对复合材料的结构和光电性能进行了表征。在紫外和可见光照条件下，研究了复合材料的光催化降解亚甲基蓝(MB)的性能。结果表明钴负载TiO2/RGO纳米复合材料具有较高的光催化活性，在60min内降解率为99%，可循环至少10次。

Hydrothermal Synthesis of Co@TiO2/PEI/RGO Nanocomposites and Their Photocatalytic Activities

Graphene oxide (GO) was firstly prepared from graphite flake powder according to a modified Hummers method. Subsequently, we developed a one-step hydrothermal method to prepare a three-dimensional (3D) cobalt loading TiO2/RGO architecture nanocomposites by using Ti(SO4)2 and CoCl2 as precursor and Polyetheylenimine (PEI) modified graphene oxide sheets as a support. PEI is used as the connection linker to successfully achieve in situ growth of TiO2 on reduced graphene oxide surfaces among the composites. Their structure and photoelectrical properties were characterized by transmission electron microscopy, X-ray photoelectron spectroscopy, UV-Vis absorption spectroscopy, and X-ray diffraction. The photocatalytic activities of the nanocomposites with respect to methylene blue (MB)were also investigated under UV and visible illumination. The results showed that the nanocomposites exhibited high catalytic performancetoward methylene blue with a high degradation efficiency above 99 % in aqueous solution. Meanwhile, the catalyst was recycled over ten times without showing a signi?cant loss in its activity.